Antonyms With Prefixes
Written by Adi Ackerman, Head Teacher
"Antonyms With Prefixes" is written for 5th Grade (Ages 10-11), and it covers Common Core L.5.5.C. If your little one is a year younger but already steady here, the page still works. You may just need to read the instructions out loud. And if they are older and synonyms and antonyms never quite stuck, this is a short review rather than busywork.


5th grade vocabulary worksheet: use prefixes like un, dis, il and ir to write antonyms, then complete sentences. Answer key included. Part of our synonyms and antonyms collection. Aligned to Common Core standards.
How do I use this worksheet?
Ask your child why the chosen synonym fits better than the other two, pointing to a detail in the sentence. For connotation, ask which word they would want someone to use about them. Check with the answer key.
What students will practice
- Students will choose the synonym that fits a sentence most exactly.
- Students will form antonyms by adding prefixes.
- Students will tell positive and negative connotations apart.
Curriculum Links
Common Core State Standards
Vocabulary · 5th Grade
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FAQ
How do I use this synonyms and antonyms worksheet?
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Ask your child why the chosen synonym fits better than the other two, pointing to a detail in the sentence. For connotation, ask which word they would want someone to use about them. Check with the answer key.
What does this worksheet teach?
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Use prefixes like un, dis, il and ir to write antonyms, then complete sentences. Antonyms are words with opposite meanings. A prefix is a word part added to the start of a word, and some prefixes make antonyms. The directions on the page read: Use the prefix bank to write the antonym of each word in Part A. Then, in Part B, write the antonym that makes each sentence true. The page opens with a worked example, and the answer key shows every answer.
Can I use this synonyms and antonyms worksheet for homeschool or classroom?
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Yes, both. We made it for 5th Grade synonyms and antonyms, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.
What is an antonym?
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A word that means the opposite of another, like hot and cold or up and down. Antonym pairs tend to be the more familiar half of this skill, since the contrast between the two words is sharp and easy to spot.
What does this worksheet ask my child to do?
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Antonyms With Prefixes. Writing the answer is the hardest version, because nothing is provided to choose from. Your child has to retrieve the word from memory and spell it, so expect this one to take longer.
How do I build this vocabulary away from the page?
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Bring it into everyday talk. At dinner or in the car, say a word and ask for a synonym or an antonym on the spot. Vocabulary sticks best when it's tied to a real moment, not just a worksheet.
What synonym and antonym skills do 5th graders need?
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CCSS L.5.5.C asks students to use the relationship between words, including synonyms and antonyms, to understand each word better. 5th graders also learn that synonyms are not always interchangeable: the precise word depends on the details of the sentence.
What is connotation?
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Connotation is the positive or negative feeling a word carries. Thrifty and stingy both describe saving money, but thrifty sounds like praise and stingy sounds like criticism.
How do prefixes make antonyms?
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Prefixes like un, dis, in, im, il, ir and non mean not. Adding one turns legible into illegible and relevant into irrelevant. The prefix sheet has students pick the right one for each word.
Is there an answer key for each worksheet?
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Yes. All four synonyms and antonyms sheets have an answer key.
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Worksheet Details
| Grade | 5th Grade |
| Subject | Vocabulary |
| Topic | Synonyms and Antonyms |
| Standard | L.5.5.C |
| Pages | 1 page |
| Difficulty | Medium |
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